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Old 05-01-2009, 02:14 PM
TrevorW
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5 minute subs

I took some 5 minute subs of B33 last night through my unmodified Canon 350d and the images appeared almost white washed, is this normal before applying darks, flats etc

Cheers
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Old 05-01-2009, 02:35 PM
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Whitewashed? I bet you more "orange washed" right?

You will need a light pollution filter. There are a number of recent threads about the IDAS LPS filters which show comparative images. The ones I took were with an unmodified 350D also.

Turbo
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Old 05-01-2009, 03:15 PM
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Do you have the link

cheers
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Old 05-01-2009, 03:16 PM
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Whitewashed.. ?
It is overexposed LP.....
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Old 05-01-2009, 07:02 PM
TrevorW
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Actually they weren't as bad as I thought although LP is fairly apparent early as B33 rose is the sky the affect of LP progressively deminished. I'll have to have another go early morning when over the zenith to get an improved image.
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Old 06-01-2009, 04:08 PM
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turbo_pascale (Rob)
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Read this thread.

There are links in it to several other threads with more images.

http://www.iceinspace.com.au/forum/s...ad.php?t=39301

My sample images are on this site: http://tinyurl.com/39cewy

Image #
12 - single sub no filter
13 - single sub IDAS LPS
14 - 5x5 mins stacked with the IDAS LPS

You can click on the images to get higher res versions

Turbo
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Old 06-01-2009, 04:35 PM
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Quote:
Originally Posted by TrevorW View Post
I took some 5 minute subs of B33 last night through my unmodified Canon 350d and the images appeared almost white washed, is this normal before applying darks, flats etc

Cheers
At what ISO setting Trev. Ive noticed this also with a high ISOsetting and too long an exposure.
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Old 08-01-2009, 07:35 PM
TrevorW
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ISO 800 Leinard sorry did'nt repsond earlier
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Old 08-01-2009, 10:58 PM
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Trev, With that camera I did 5min subs from home (light pollution city) and got white/orange images that were extremely hard to edit.. I did 10 minute subs from a dark site and got nothing like that at all...

A light pollution filter is what you need.
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Old 09-01-2009, 12:12 AM
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Quote:
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Trev, With that camera I did 5min subs from home (light pollution city) and got white/orange images that were extremely hard to edit.. I did 10 minute subs from a dark site and got nothing like that at all...

A light pollution filter is what you need.
heres a good one Trev
http://www.astrosurf.com/~buil/city/result.htm

If I got my wires crossed right, IDAS LPS filter would do much better in LP with a UV/IR mod, although with only a UV/IR mod in less LP skies, imaging would be better.
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